Hobbing machine



AEDGAR 9 Sheets-Sheet l w s v.. R'MJ FM mE R N m E w@ MQMU A l o `Q s Ju f Ww m l E o ahw www w NQ o l 2N Sw d uw. f 1T; .A i Auw D /N .Pv a m Ww Q Nw n H m \|\w\ i o Qw Mm.. QN i :la: @WS f v|||r|..|.||. n 0 1&1 Nm, QN N. mw \QN March 28, 1939. J, EDGAR HOBBINQ MACHINE Filed sep't. 11, 1935 9 Sheets-Sheet 2 99 NQ wmwm mw ww A om. @uw Nm. W Nw Q. @QN WW .QON v www www #//f .W Q NWN $.W` ww W O 4 G w// 4. O v. Q n 2 IIL @L Q m.

March 29, 1939. l EDGAR 2,152,469

- HOBBINGl MACHINE 'Filed sept. 11, 1935 9 sheets-sheet :5

/F'l' mvENToR .Jo hn Edg a r BY oa/q Mm,

a ATTO NEYs March 28, 1939. "LL EDGAR HOBBING MACHINE Filed Sept. 1l, 1935 9 Sheets-Sheet 4 w hs March 2s, 1939.

J. EDGAR 2,152,469

HOBBING MACHINE v 9 snets-sneet 5 Filed sept. 11, 1955 INVENTOR rJo /7 n Edgar BY mda; M1, y. w g

' A ORNEYS Mmh Vzas, 1939. 1 EDGAR 2,152,469

HOBBING MAGHTLNE` Filed sept. 11, 1935 9 sheets-sheet e 206 05 j* 19/ Ii '07 y 3 INVENTOR ufo/m Edgar BY my p ,LW

' A ORNEYS March 28, 1939. J. EDGAR 25152469 l HOBBING MACHINE Filed sept. 11, 1955 9 sheets-smetr 7 vn Mm, ,n

- ATTORNEYS March 28, 939.

l J. EDGAR HOBBING MACHINE Filed Sept. ll, 1955 9 `Sheets-She'et 8 INVENTORr .f John Edgar BY ATTORNEYS March 2s, '1939. J. EDGAR HOBBING MACHINE 9 Sheets-Sheet 9 Filed Sept. ll, 1935 Patented Mar. 28, 1939 PATENT OFFICE :naam noname -mcimm IJolml Edgar, Rockford, lll., signor to Barber- Colman Company, Rockford, Ill, a corpora'.-

- tion of Illinois Application september 11, 1935, sei-n1 No. 411,041

,18 Claims.

vThe present invention'relates. to improvements in hobbing machines, and has particular refer- 4 ence to anew and improved machine of this character having a wide and flexible `range of usefulness adapting it for many different kinds of work.

One of the objects of the invention isto provide a novel hobbing machine in which the hob can be fed relatively across the work tangentially, longitudinally or obliquely.

A more specific object resides in the provision of a new and improved hobbing machine'in which the hob has two swivel adjustments relative to the work, one to define the angle of hob feed,

and the other to define the angle of the hob axis relative to the direction ofy feed. H l Another object is to provide a novel hobbing machine including a differential interposed in the drive for one of the work and tool spindles, and operable in timed relation ,to the relative feed v translation between 'the work and the tool.

A furtherv` object resides inA the provision of a hobb'ing machine having novel power means fog translatingl the tool relatively to the work selec tively in a rapid traverse or feed, the power means including traverse and feed. controls andV interlock means therebetween.

Other objects resideNin the provision of a new and improved scale-located stop for positioning the work, and novel direct-reading dials for locating the work spindle vertically and the hob spindle horizontally. i

Further'objects and advantages will become'v apparent as the description proceeds.

In. the accompanying drawings, Figure 1 is a front -elevational view 'of amachine embodying y the features of my invention.

Fig. 2 is a planview of the machine.

` Fig. 3 is a fragmentary end '-view, partially 404 broken away to show one arrangement of speedl change gearing inthe machine.n

Fig. 4 is a perspective diagrammatic viewl of the, various machine drives. j I

. Fig. 5 is a fragmentary sectional view, taken substantially along lline 5--5 of Fig. 3, and showing a. reversinggearing in one of the drives,

Fig. .6 is a-fragmentary view, partially in section, along line 6 6 oi' Fig. '3, and. illustrating the controls for the-drives., v

Fig. 'I is 4a fragmentary vertical sectional view,

partially diagrammatic in character, taken substantially along line 1-1 of Fig. 6.

Fig. 8 is a fragmentary vertical sectionaljview takenalong line 8-8 of Fig. 7.

Fig. 9 is a fragmentary transverse vertical sec- (Cl. lit-3). A tional fview o f the machine taken along line l-I.

tail views taken respectively valong lines Ii-II A and i2-l2 of F18. 10.

Fig. 13 is a diagrammatic view illustrating the operation of the machine.

Referring more particularly to the drawis, the machine constituting the preferred em ment of my invention has a frame structure (see Fig. 1) generally comprising 'a horizontal elongated iloor bed I4, and a headstock column I5 and an.upright end support li rigidly mounted respectively on opposite ends of the bed.

Mounted for vertical translation along parallel `guides I1 (see Fig. 2) on the front of the column I5 is a headstock il having a housing Il in which a horizontal spindle 20 is suitably journaled for a rotary power drive.

' In the present instance, the spindle 20, which extends longitudinally ofthe bed I4, is adapted to support and drive the work A in a xed adjustable position. Thus,the housing i9 is supported for manual adjustment by means of a vertical screw' 2| fixed in the column Il, and a rotary nuty 22v mounted on the rear of the housing Il andin threaded engagement with the lower end portion of the screw. The nut 22 constitutes a worm wheel in mesh with a worm 23 on the rear end of a horizontal adjusting shaft 24 journaled in the housing`i9. The shaft 2-4 extends to the front of the housing I9 where it is squared for engagement by a suitable hand tool (not shown).

- Rigidly attached at one end to the top of the housing i 9 and extending 'in vertically spaced re- -lation along the top of the bed I4 isa horizontal-V over arm. 2l The other end of the arm is supported byel slide block 2i mounted for vertical adjustment. along 'guides 21- on the end support li. A vertical adjusting screw 28 isv rotatably anchored at'its lower end in the block\26, and is in threaded engagement at its opper-'end with a` nut 2l xed on the support Il. The screw 221s connected through bevel gears 3l and 3i vto one end,of a horizontal shaft 32 which is supported in and extends through andalong the over arm 2l. The-other end of the shaft 22 is connected through bevel gears andjfto a vertical stub shaft 25 which isjournaled in the housing It, vand which is connectedrthro'u'gh 'a worm wheel I 28 and worm .l'rto the adjusting shaft 24. Op-

eration oi the' shaft 24 will adjust the housing u I9 and over arm 25 as a unit. A direct reading micrometer dial 38-is provided on the forwardv end of the shaft 24 to indicate the vertical adjustment of lthe work.

The over arm 25 is provided on its under side with longitudinal parallel guides 39. A depending tail stock 40 of suitable construction is/ V mounted on the guides 39 for adjustment along the arm 25, and has a center 4I in axial alignment with the spindle 20.

The machine may be used for cutting various types of work pieces, for example gears and spline members. If a gear blank is to be cut, lt is mounted upon an arbor 42 extending into and clamped in the spindle 20 and in end engagement with the center 4I. The machine is especially adapted for the cutting of the externally keyed members, of multiple key shaft couplings, having longitudinally acting wedge surfaces, fork example on the sides of the keys as disclosed in my copending application Serial No. 620,449, filed July 1, 1932, or on the roots of the spaces between the keys as disclosed in my prior patent, No. 1,905,278, dated April 25, 1933. For purposes of illustration, the inside member of a coupling of the last mentioned character is shown in Fig. 13 hereof. More particularly, the finished work blank A is shown as comprising a cylindrical shaft end having a plurality of uniformly peripherally spaced longitudinal keys separated by interdental spaces with longitudinally tapered roots. These roots are arcuate in cross-section, and segments of a cone.

Mounted on the bed I4 between the column I5 and the end support I6 isa tool support 43 (see Figs. 1, 2 ,and 9 to 12). In its preferred form, the support 43 comprises a saddle or carriage 44 secured to the bed I4 for adjustment along longitudinal guides 45. A screw 46, extending longitudinally between the guides 45, is in threaded engagement with a xed nut 41 on the underside of the saddle 44, and is rotatably anchored in a bracket 48 on one end of the bed I4. 'Ihe outer end of the screw 46 is squared for hand actuation by means of a 'tool (notshown), and is provided with a direct reading micrometer dial 49. g

Mounted on the top of the saddle 44 is a slide swivel or support 50 provided with parallel horizontal guides 5I. 'I'he support 50, which preferably is generally circular in form, has an annular tongue 52 on its underside engaging in a groove 53'in the top of the saddle 44, and hence is confined for rotary adjustment about a vertical axis into any desired angular position through 360 degrees. Secured about the periphery of the support 59 is a coaxial worm wheel 54 which is substantially enclosed by a guai-d- 55. and which meshes with a worm 59 in a casing 51 on one side of the saddle 44. The worm 59 is fixed on a shaft 59 journaled in an elongated bearing sleeve 59 on the casing 51, and extending therethrough to the front of the bed I4 for hand actuation. A micrometer dial 99 is provided on the forward end of the shaft 59.

'A tool slide BI is mounted on the swivel 59 fo a power feed along the guides 5I, and is formed with an annular seat 92 about a central opening 69.v A tool swivel or bracket 94 is mounted for .angular adjustment on the seat 92, and is centered by an annular depending flange 65 bearing in the opening 63. The tool swivel 94 is-secured in vposition of adjustment by means of a plurality of bolts 69 engagingl in a -coaxial inverted T-slot in the seat 82. An annular trough 9|* on y the notch 99 to hold the clutch 14 in closed posi:`

the slide 6I surrounds the tool swivel 9.4.

The top of the swivel 94 is provided at opposite sides of its axis with two upstanding bearings- 91 and 68 in which a power driven tool spindle 69 is suitably mounted. Any suitable tool may be mounted on the spindle 69, depending on the character of the work to be performed, and. in the present instance I haveshown a hob B comprising `a series of relieved finishing teeth arrangedin a single helical thread of constant lead in a cylindrical pitch surface. The tooth thread is uniform in width at the pitch surface ,andis tapered in height from end to end relative tothe hob axis. The tops of' the teeth arelateraily inclined in any axial plane of the hob so as to be coincident with the longitudinal `taper of the latter.

It will be evident that the hob swivel 64 permits the hob to be adjusted at an angle to the'work affords a second adjustment by reasonv of which the hob B may be power fed ila/any desired angular `direction relative to the work. Suitable verniers 1re provided for indicating the angular adjustment of the hob and slide swivels. For cutting spur gears, the hob B wouid beffed axially of the spindle 20. For cutting worm wheels the hob B would be axially fed perpendicularly of the spindle 29. For cutting the coupling member A, the hob B would be fed at an 'angle to its axis and diagonally across the axis of the work so as to cut in an axial plane of the work a foreshortened projection of the longitudinal form of the hob.

'I'he work and tool spindles 29 and 59 are driven in timed relation from a common power source. In the present instance; power is supplied by an electric motor 10 connected through a belt 1I to a pulley 12 which is adapted to be connected to a drive gear 19 through a one-way speed clutch 14. The gear 19 'meshes with a gear 15 on a shaft 16 connected through 4gears 11 and 19 to a main drive shaft l19 journaled'within the base I4 and extending longitudinally therethrough. Parallel gear drives lead from the shaft 19 to the spindles.

The clutch 14 is operable by a yoke 99 on a rock shaft 9| journaled in and extending to the front tending axially through the cylinder 99 and con-v nected at one end tothe plunger 95 is a pull rod 99. The outer end of the rod 99 has a head formed with a longitudinal slot 90 receiving a pin 9|4 on an actuating lever 92 vpivoted to the I4. A tension spring 99 tends to oscillate the lever 92 in a direction to release the rod 99.

Pivotally mounted on the bracket 91 and normally lurged by a spring 94 through 'a slot95 in the cylinder 99. into a' transverse notch 99 in the plunger Il is a-reta'ining latch 91 (see Fig. 7) It will be seen that movement of the lever 92 vto the left. as viewed in Figs. 1 and 6, will close the clutch I4 against the action of the spring 99. In the closing operation, the latch 91 will snap into series of index change gears 33 to |0|. `gears are mounted within a gear casing |32 ony tion. Upon release of the latch 31, the spring 33 will cause the clutch 14 to open. Y

'I'he rotative drive for the work spindle (see Figs. 3 to 5) is taken from the shaft 19 through a These the left end ofthe bed |4. The gear |0| is connected through a reversing mechanism |33 (see Fig. 5) to the lower end of a vertical shaft |04. In its preferred form, the reversing mechanism |03 comprises a spline shaft |05 to one end of which the gear |0| is fixed and on whicha sleeve |06 is keyed for axial adjustment. 'Bevel gears |01 and |03 are xed on opposite ends of the lsleeve |06 for movement selectively into meshing engagement with opposite sides of a bevel gear |09'xed on the lower end of the shaft |00. The adjustment of the mechanism |03 is adapted to be vefl'ected by a rotary collar |06* threaded on the sleeve |06, and normally secured in fixed position by a lock |06".

The vertical shaft |04 is. sectioned, the upper section being identified as |04*,and the two sections are connected by a differential mechanism ||0. In the present instance, the differential mechanism comprises bevel gears and ||2 secured respectively on the adjacent ends of the sections |04 and |04* and meshing with opposite sides of two bevel gears ||3 and H4. vThe latter are journaled in a yoke ||5 which is rigid with a worm wheel ||6 rotatable on the shaft |04, and meshing with a worm |1. When the worm wheel |6 is, stationary, the shaft section |04* will rotate oppositely to but at the same speed as the shaft section |04. 'I'he direction of rotation may be reversed by means of the mechanism |03.

Splined for axial movement on the upper endof the shaft section |04*, to accommodate the vertical adjustments of the headstock I3, is a worm |3 which meshes with a worm wheel ||9 on the spindle 20 to complete the power drive.

'Ihe drive for the ltool spindle 33 (see Figs. 4, 9 and 10) `comprises' a bevel gear |20 having an elongated hub splined for axial movement to the shaft 19 to accommodate adjustment of the saddle 44 along the bed |4. The gear |20 is movable with thel saddle 44, and meshes with a bevel gear |2| on the lower end of a vertical stub shaft |22 extending through and journaled in a bearing sleeve |23 (see Fig. 9). The sleeve |23 is seated in an opening |24 in the saddle 44, and is coaxial with the slide swivel so that the drive will be completed regardless of the direction of feed of the sli'de 6|. A crown gear |25 is fixed on the upper end ofthe shaft |22, and meshes with a pinion |26 on a horizontal spline shaft |21 journaled at one end in a split bearing |23 on the slide swivel 50. The shaft' |21 extends diametrically of the slide swivel 50, and slidably through a bevel gear |23 journaled in a depending lug |33 on the underside of the hob slide 3|.

Meshing with the bevel gear |23 is a bevel gear |3| which is journaled for rotation on the axis of the hob swivel 34, and which is substantially enclosed by a housing |32. A bevel gear |33, coaxial and rigid with the gear |3|, meshes with a bevel gear|34 flxed on a shaft |35 parallel to the hob spindle 33 and journaled in the' hob swivel 64. It will be evident that the drive connection from the gear |23 to the gear |34 is maintained regardless of the angular position of adjustment of the hob swivel 34. The shaft |35 The translatory drive for the hob slide 3| is taken from a spline shaft |39 which extends 1ongitudinally within the bed |4, and which is adapt- Led to' be driven in timed relation to the shaft 19 at a feed rate in one direction, or at a rapid traverse in either direction. The drive comprises a bevel gear |40 (see Fig. 12) journaled in a bearing lug |4| on the underside of the saddle 44 for movement therewith, and splined for free 'axial movement on the power shaft-|33. A bevel gear |42, xed on a vertical stub shaft.|43 journaled in and extending through the saddle 44, meshes with the gear |40. Fixed on the upper end of the shaft |43 is a gear |44 meshing with a large gear |45 mounted in a circular recess |46 in the top of the saddle 44 for rotation about theaxis of the slide swivel 50. In the present instance, the gear |45 isl journaled on,the bearing sleeve |23, and projects from the recess |46 upwardly into a registering recess |41 in the slide swivel 50. Meshing with the gear |45 within the recess |4'1 is a gear |43 fixed on the lower end of a vertical stub shaft |49 (See Fig'. 11). A Worm |50 on the shaft |49 meshes with a worm wheel |5| on a feed screw |52.' One end of the screw |52 is suitably journaled in the split bearing |23 Y andthe other end is in threaded engagement |55 from the shaft 16 either through the gear 15 and a gear |56 or through gears |51, |53 and |59. The clutch |55 (see Figs. 4 to 8) comprises a yoke |60 on a rock shaft |6| extending to the front of the bed I4. Secured to'the forward end of Ithe shaft |6| is an operating lever |62. A second lever |63 is fixed intermediate its ends to the shaft |6|, and is pivotally connected at its free end to a plunger |64 reciprocable in' a cylinder |35 in the bracket 31. Coiled compression springs |66 and |61 engage opposite endsof the plunger |64, and tend to center the latter, and there-by to move the clutch |55 into intermediate or neutral position. To provide means for holdf and 5) is connected through gears |13, |14 and |15 to a shaft |16 which in turn is connected through -feed change gears |11, |13, |19.and|30,

in the housing |02, to a shaft |3|. A worm |32 on the shaft |3| meshes with a worm wheel |33 rotatable on a shaft 34 and adapted to be con'- nected thereto by the clutch |12. The shaft |34 is connected through bevel gears |35 and |36 to a shaft |31 which in turn is connected through gears las, las and m to th shan ns.

The shaft |34 extends to the front of the machine, and is there provided with a hand wheel |3| whereby a manual feed may be effected wh the clutches |55 and |12 are open. v

The clutch |12 is operable through a rod |32 from the front of the machine by a two-position lever |33 pvoted intermediate its ends to the column |5. A-second lever |94, pivoted intermediate its ends to the bed I4, has a pin-and slot connection |35, |33 with the'lower end of thel clutches |55 and |12 are interlocked so that both cannot 'be closed simultaneously. Thus, they upper end of the lever |53 (see Figs. 6 and 8) is formed with a notch |99 which when in neutraa or intermediate position only is adapted to re- .ceive a tooth or projection |99 on the upper end of the lever |93 upon closing of the clutch |12. When the clutch I 55 is closed in either direction,

/ the end face of thelever |53 on either side of the notch |99 willthrough coaction with the projection |99 lock the feed clutch |12 in open position. When'the clutch |12 is closed, the projection |99 will engage in the notch |98 to lock the clutch |55 in neutral position.

The rotation of the work spindle 20 is adjusted to compensate for the translation of the hob B relative to the work A. To this end, the shaft |91 is .connected through differential change gears 200 to 205,` in the housing |02, to a shaft 204 on which the worm ||1 is fixed. Thus, when the translatory drive for the hob B is disconnected, the differential worm wheel H6 will be held stationary, and the speed of the shaft |04 will be the same as that of the shaft |04 in the work spindle drive. When either the rapid traverse or feed is connected, the worm Wheel ||5 will be rotated in synchronism therewith to advance or retard the rotation of the shaft |ll4a relative to the shaft |04, depending on the direc- `,tion of translation. By reason of the differential adjustment, the hob B can be`fed through the work,`or allowed to come to rest at any point in its feed movement and merely rotate in mesh with the work.

'I'he clutches 14, |55 and |12 are controlled by dogs on the hob slide 5|('to provide a hob feed program comprising a rapid approach, a feed and a rapid return. Referring to Figs. 1 and 1,

three-pivotal dogs 205,'255 and 201 are mounted on the slide 9| lfor adjustment along a T-slot 205. Each dog has an inclined cam face on its lower end disposed for engagement with the free end of a lever 209 xed on a shaft 2|5 journaled in` the slide swivel 59. In the present illustration, the cam ends of the dogs 255 and 205 are adapted to engage and depress the lever 259 in the course of forward movement of the slide 5|. and the dog y201 is arranged to act similarly upon reverse movement of the slide.

Secured tothe shaft 2|5, is'an arm 2li (see- Fig. 9) arranged to engage and depress arod 2|2 extending slidably through the shaft |22. The.

lower end of the rod 2|2 engages the free-end of an arm 2|3 on a horizontal rock shaft 2|4 extending through the bed |4to the left end of the machine. An arm 2|5 is adjustably clamped to the shaft 2|4. and has a'bolt 2|5 threaded in 'its free end for engagement. with the tail end of -the detent lever |15. A transverse pin 2|1 on the lever |15 overlies the'tail end of .the latch' 91, and is opeable torelease the latter from the notch 95 when the lever |15 is released from the plunger |54. Y

Mounted on the over arm 25 for adjustment along'the ways 39 is a work stop 2|5. A suitable proach. The eed' clutch I1 POsition. When the hob-B is about to move into scale 2| 9 serves to indicate the justment of the/stopl 2|9.

In operation, the work to be cut is mounted for position of adrotation by the spindle 20.' The position of the Work longitudinally of 'the over arm 25 is determined by the stop 2|5 and the vertical position of the work is determined by a direct reading of the micrometer dial 39.

The tool spindle 59 is appropriately adjusted to l by means of the shaft 59 as indicated by the' micrometer dial 60 to determine the path of movement of the slide 6| and hence the direction of feed of the hob B. The adjustment is also indicated by the Vernier scale on the swivel 50. The angular position of the hob axis relative to the direction of feed is adjusted by means of the swivel 64 which may be clamped in place by the bolt 65.

For cutting a spur gear, the swivel 50 is so adjusted that the slide 5| is translated longitudinally of the work spindle 20. and the hob swivel 54 is so'adjusted that the hob axis will be inciined to the perpendicular to the work spindle at an angle corresponding to the lead angle of the hob thread. For cutting a worm wheel, the swivel 50 is so adjusted that the slide 5| will be fed perpendicularly to themwork spindle 20, and the swivel 54 is so adjusted that the axis of the hob of the hob thread. The swivel 50 is so adjusted that the direction of feed extends diagonally across the work as indicated by the line f-f.

In operation, the saddle 44 and the slide 5| initially are so positioned'relative to the work A that the large end of the hob B will in being fed along the path f--f cut the outer end of thework A to full depth at the point o. Initially, the lever 92 is actuated to the left to close t clutch 14, and the lever |62 is actuated to t e left to close the clutch |55 andthereby titute a rapid apis locked in open cutting engagement with the work A, the dog 205 engages the lever ,209 thereby releasing the detents 91 and |10. As a result, the clutch 14 is opened and the clutch |55 is returned 'automatically into neutral position.

To now institute the feed,` the lever 92 is actu- :sol

ated to the left to close the clutch 14 and, throughl f movement of the shoulder |91 from the lever |94', to release the clutch |12 for closing movement. The lever |93 is actuated to the left to closethe clutch |12, thereby institutingl the f eed drive. Thetraverse lever |52 is locked in neutral position. The hob B is fed from the position indiv v cated in dotted outline in Fig. 13 completely across the work. ment, the work A and the hob B are rotated in During the cutting engage-'5 timed relation, the relative rotation being suitably adjusted by the diiferential mechanism |I5 to compensate for the feed. In the 4course of the said spindle in any angular pomtion of said slide feeding said slide and driving said mechanism in cutting action, the longitudinal form of the hob is projected in the direction f-f onto the work to produce a foreshortened form on the latteras the cut proceeds progressively from end to end. At the end of the cutting operation, the dog 2M engages the lever 209 to release the detent 91. Thereupon, the spring I8 shifts the plunger 85` to the right to open the clutch 1l, and through ilheza levers l94 and |83 to open the feed clutch The lever 92 now is again actuated tol the left to close the clutch 1I and the lever |62 is actuated to the right to close the clutch |55 in a direction to institute a rapid return movement. In this movement, the lever 209 lifts the pawl 205 without being depressed. At the end of the-return movement, the dog 201 depresses the lever 209 to open the clutches 14 and |55, thus com pleting the cycle.

I claim as my invention:

1. A hobbing machine comprising, in combination, a work spindle, means for supporting-said spindle in a xed position, a saddle adjustable axially of said spindle, a hob spindle, means on said saddle for supporting said hob spindle for translation in different selective angular directions relative to said work spindle including a direction axially of said work spindle and a .direction perpendicular to said work spindle and for adjustment into different angular positions relative to the direction of translation, power drive means for rotating said spindles in timed relation, and power drive means for translating said hob spindle and simultaneously adjusting the rotary phase relation of said spindles in timed relation to the translation of said hob spindle.

2. In a hobbing machine, in combination. a base, a saddle slidable on said base, a swivel mounted on said saddle for angular adjustment about a vertical axis, a slide mounted onsaid swivel for translation transversely of said axis, drive means for feeding said slide in any angular position of said swivel and including control clutch means in said base, 'an automatic trip mechanism for effecting opening of said clutch means and operable by said slide in any angular position of said swivel, a swivel mounted on said slide for adjustment about a vertical axis, a spindle mounted ony said last mentioned swivel,` and drive means for rotating said spindle in any angular position of said slide and in any angular position of said spindle relative to said slide.

3. In a )mobbing machine, in combination, a swivel mounted for angular adjustment about an axis, a slide mounted on said swivel for translation transversely of said axis, drive means coaxial with said axis for feeding said slidein any angular position oi' said swivel, a swivel mounted on said slide for adjustment about an axis parallel to said first mentioned axis, a spindle mounted on said last mentioned swivel, and drive means coaxial with said last mentioned axis for rotating and in lany angular position of said ,spindle relative to said slide. j 4. A hobblns machine comprising, in combination, a frame, a work spindle, a hob spindle ,=a

slide on said frame foi' supporting one of said spindles for translation, means for vsupporting the other of said spindles on said frame," common drive means having branch drives for rotating said spindles in timed relation, a differential mechanism in the drive for the workspindle, and drive means parallel to said mechanism for timed relation to the feeding movement.

5. A hobbing machine comprising, in combination, a work spindle, a hob spindle, a slide for supporting said hob spindle, parallel drives for rotating said spindles in timed relation, one of said drives including two aligned shaft sections with bevel gears on their adjacent ends, a cage supporting two bevel gears in mesh with said first mentioned gears and mounted for rotation about said shaft sections, a reversible rapid traverse drive for said slide, la feed drive for said slide branching from 'one of said' spindle drives7 in advance of said cage, clutch means for selectively connectirg one or the other of said two last mentioned drives, and means for rotating said cage in timed relation to the drive of said slide to vary the relative rotation of said spindles so as to compensate at all times for the translation of said slide. l v

6. In a hobbing machine, in combination, a base, two power shafts extending in said base, a

saddle slidable along said base and said shafts,

two gears movable with said saddle and splined.

krespectively to said shafts, av vertical bearing sleeve opening through said saddle, a vertical shaft journaled in said'sleeveand connected to one o f said gears, a slide swivel mounted on said saddle for angular adjustment about the axis of said vertical shaft, a slide mountedon said swivel for adjustment transversely 'of said axis, a feed screw journaled in said swivel and in operative threaded engagement with said slide, means connecting said screw to the other of said gears and including a. gear rotatable on 'said sleeve, a spline shaft rotatably journaled in said swivel and geared to said vertical shaft,l a hob swivel mounted on said slide for adjustment about a vertical axis,

. a hob spindle mounted on said hob swivel, and a vertical shaft coaxial .,with said hob swivel and geared to said spline shaft and said hob spindle.

7. In a bobbing machine, in combination, a base, a power shaft extending in said base, a saddle slidable onsaid base along said shaft, a gear movable with said saddle and -splined to said shaft, a vertical shaft journaled in said saddle and connected to said gear, a slide swivel mounted on said saddle for angular adjustment about the axis of said vertical shaft, a slide mounted on said swivel for adjustment transversely of said axis, a spline shaft rotatably journaled in said swivel and geared to said vertical shaft, a hob swivel mounted on said slide for adjustment about a vertical axis, a hob spindle mounted on said base, a power shaft extending in said base, a

saddle slidable onA said base along said shaft, a

' gear movable with said saddle and splined to said shaft, a slideA swivel mounted on said saddle for angular adjustment about a vertical axis, a slide.

mounted on said swivel for adjustment transversely of said axis, afeed screw journaled in said swivel and4 in operative threaded engagement with said slide, a gear rotatable on said axis and having an operative drive connection with said first mentioned gear and with said screw, and

a hob spindle on said slide.

Q ,9. A hobbing machine comprising, in combination and vincluding means' for eifecting'a relative reversal of rotation of said spindles and includlng a differential mechanism in the work spindle and driving said differential mechanism in timed relation, said last mentioned means including a reversible rapid traverse drive and a one-way feed ldrive.

10. A hobbing machine comprising, in combination, an elongated horizontal base, acolumn on one end of said base, `a headstock havinga work spindle and vertically adjustableon said column, an over arm movable with said headstock, means including a direct reading gauge for adjusting said headstock, a Support slidable on said base, means including a direct reading gauge for feeding said support on said base, a hob spindle mounted on said support for translation in different angular directions and for independent angular adjustment,v means for rotating said spindles and means for translating said hob spindle on said support."

11. A hobbing machine comprising, in corny bination, anelongated horizontal basesa column on one end of said base, a headstook having a work spindle and vertically adjustableon said column, an over arm movable with said headstock, means including a direct reading gauge for adjusting said headstock, a support slidable on said base', means including a Adirect reading gauge for feeding said support on-said base, a

hob spindle mounted on said support for translation in diiferent angular directions and for independent angular adjustment, a direct reading gauge for indicating the path of movement of said hob spindle, a work locating support on said over arm, means for rotating said spindles, and means for translating said hob spindle on said ilrst mentioned support.

12. In a hobbing machine, the combination of a bed; an adjustable support on said bed; a

swivel, a slide and a second swivel mounted on said support in superimposed relation; a tool spindle journaled on said second swivel; means for driving said slide through a feeding movement and return; means for adjusting said swivels through wide ranges of angular adjustment to `position a tool on said spindle. inl any angular position and yfor translation along any path paralleling the plane of the slide; drive means journaled in said bed and extending beneath said support; and 'driving connections between said .drive means and said spindle and slide extending upwardly through the superimposed assembly of the swivels and slide and operative inv any relative position of adjustment `of the parts.

13. In a bobbing machine, in combination,

' a swivel mountedfor angular adjustment about its axis,` a' slide mounted on said swivel for translation transversely of said axis, a vsecond swivel on said slide mounted for adjustment about its axis, the axes bf said swivels being parallel, a spindle yjoui-naled on said second swivel, and separate drive means for said slide and spindle each including a member journaled on the( axis of the iirst mentioned swivel.

14. A nothing machine oomprmng, in oom- `spindle drive, and means parallel to said dif- 'ferential mechanism for translating said tool nections with prime mover through said control clutch and including a reversing clutch, a feed drive for said slide having driving connections with said prime mover through said contions of a predetermined length and separated by elongated spaces with root surfaces eoncentricin form about the axis of rotation, comprising, in

combination, an elongated horizontal base, a column on said base, a horizontal work spindle. for supporting said member in axial alignment therewith and extending longitudinally of said base and mounted on said column for vertical adjustment, a saddle slidable longitudinally on said base, a swivel mounted on said saddle for angular adjustment about al vertical axis, a slide mounted on said swivel for translation transversely of said vertical axis, said swivel being adjustable to position said slide for movement ink a rectilinear path extending diagonally across the axis of said member, a second swivel mounted on said slide for adjustment about a vertical axis, a horizontal spindle adapted to support a hob and mounted on vsaid second swivel, said second swivel being adjustable to position the axis of said hob at an angle to a perpendicular to the axis of said member. corresponding to the hob lead angle, drive means for feeding said slide to move said hob along said rectilinear path at an angle to said hob axis through cutting engagement with said member with said Ahob in a position longitudinally inclined at said angle corresponding tosaid lead angle, said hob having an eective length such that the projection of its axis along said rectilinear path on an axial plane of said member is coextensive in length and posi-A tion with the projections to be'cut, and drive' means for rotating said spindles in timed', relation to each other and to the feeding movement of said slide.v 16. Ahobbing 'machine comprising, in combination, a frame, a work spindle, a hob spindle, means for supporting one of said yspindles on said frame, a saddle mounted on said frame for adjustment axially of said one spindle, means 'on said saddlefor supporting `the other of said .spindles for translation in diiferent selective angular relations to'said one spindle and for adjustment into diil'erent angular positions rela--A tive tthe direction of translation, common drive bination, a prime having a control clutch,

a work spindle, a hob spindle,-means including a swivel and slide for supporting said spindles for relative translation and angular adjustment.

moons for driving nid work spindle and prima mover thrown said control clutch', o rapid traverse drive for said slide having driving conmeans having branch drives for rotating said spindles in timed relation,l a differential mechanismin the drive for said one spindle, anddrive` means parallel to said mechanism for translating said other spindle and for Vdriving said mechanism in timed relation to the translation of said other spindle. A y

17. In a bobbing machinehin combination, a base; aisaddlc slidable on said base; a swivel mounted on said saddle for angular adjustment about a vertical axis; a islide mounted on said swivel for translation transv' ersely A -of said axis; power drive `means for feeding said,

einem slide for actuating said member to release said,

detent means; a swivel mounted on said slide for adjustment about a vertical axis, a spindle mounted on said last mentioned swivel; and drive means for rotating said spindle 'in any angular position of said slide and in any angular position of said spindle relative to said slide.

18. A hobbing machine comprising, in combination, a Work spindle, a hob spindle, means f for supporting one of said spindles in a xed position, a saddle adjustable axially of said one spindle, means on said saddle for supporting the other of said spindles for translation in different selective angular directions relative to said one spindle including 'a direction axially of said one spindle and a direction perpendicular to said one spindle and for adjustment into different angular positions relative to the direction of translation,

a power drive, a transmission including a selfopening main clutch for connecting said drive to rotate said spindles in timed relation, releasable detent means for holding said clutch in closed position, a rapid traverse transmission branching from said first transmission and including a selfopening reversing clutch for translating said other spindle, releasable detent means for holding said reversing clutch in closed position, a feed transmission branching from'said rst mentioned transmission in advance of said reversing clutch and including a one-way clutch for translating said other spindle, interlock means for opening said one-Way clutch upon opening of said main clutch, interlock means for preventing simultaneous closing of said reversing clutch and said one-way clutch, and means for automatically releasing said detent means upon movement of said other spindle into` a predetermined position of translation.

JOHN EDGAR. 

